Furnace.



R. M. SPENCER.

FURNACE.

APPLICATION FILED MAR. 14. 916.

1,%78;?7& Patented Sept. 10,1918.

2 SHEETS-SHEET I.

fiymvm'iaf enceh R. M. SPENCER.

Patented Sept. 10, 1918.

2 SHEETS-SHEET 2.

mu 5N 3mm g' kencer RAYMOND M. SPENCER, 01E COLUMBUS, OHIO.

FURNACE.

Specification of Letters Patent.

Patented Sept. Ml), 1918.

Application filed March 14, 1916'. Serial No. 84,195.

To all whom it may concern:

Be it known that a citizen of the United States, residing at Columbus, in the county of Franklin an State of Ohio, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

My invention relates to furnaces and is particularlydirected to the improvement of hot air furnaces, the main object of my improvement being a construction whereby all the useful heat contained in the products of combustion as they leave the furnace structure may be extracted to heat up the incoming cold air. I also aim to provide a construction such that an excessive amount of heat will not be extracted as will cause condensation to thereby produce a quantity of water to cause rusting and corrosion of the furnace structure as a Whole.

A further object of my invention resides in building my furnace in units so that furnaces of various capacities may be very readily installed, as may be desired.

A further object of my invention resides in providing a plurality of fume conducting pipes arranged side by side on opposite sides of the furnace structure, these fume conducting pipes being of such cross section that adjacent sides of each pair of pipes on the same side of the furnace will present a fiat or plain surface so that a sheet of air may be caused to pass between the various sections in order that it may be uniformly heated.

Other objects of my invention will become more apparent after a further detailed description of the accompanying sheets of drawings, in which similar characters of reference designate corresponding parts, and in which:

Figure 1 is a horizontal sectional view of my furnace, the section being taken just below the casing top,

Fig. 2 shows my furnace structure in front elevation, the surrounding casing being shown in section,

Fig. 3 is a section taken on line Fig. 1, and,

Fig. 4 is a section taken on line 4-4 of Fig. 1.

In the drawings, 1 have shown the furnace proper as inclosed within a casing 1, this casing being provided at its rear with a pai. of openings such as shown at 2 in Fig. 2 for the admission of air to be heated.

I, RAYMOND M. SPENCER,

and a series of openings The casing itself has its ends, sides and top constructed of flat sheet metal plates against the inside of which are mounted the corrugated liners 3, these latter being provided to form substantially a layer of air against the inside of the outer plates to guard against excessive radiation to the furnace room atmosphere. It will be noted that these inside plates are slightly spaced from the floor and top as shown at 4 and 5 respectively. The vertical edges of the sides and ends are bent out at an angle as shown, to be embraced by the engaging strips 16 while the top is secured directly to the ends and sides as is shown at 7 Within this casing are located a plurality of units, each unit comprising a pan 8 carrying a casting 9 which serves the purpose of a combustion chamber, the two being separated by a plate 10 perforated as at 11 to permit the passage of air to the burners. The upper portions of each of these castings 9 are formed with a circular collar structure 12, over each of which a dome 13 having a pair of laterally extending pipe arms is arranged to fit. Reference particularly to Fig. 4 will show that each of the castings 9 is formed with an upwardly projecting flange such as is indicated at 14, the various sections being held together by being bolted through these flange portions. The rear section is closed by means of the cover plate shown at. 15, while the front section carries the usual type of face plate 16 embodying a lighting door 17, air inlet 18 leading to the fire box, 19 to permit the passage of burner pipes designated '20. It will be noted that these burner pipes are also formed in sections, the various sections being held together by means of fittings 21, while the rear portion of each pipe as a whole, is capped by means of the caps shown at 22. A supply valve structure 23 of any desired type is also applied to the front of each of these burners. I

Located on opposite sides of the fire box structure 9 and disposed in vertical array are a series of cold air conducting pipes 24, these pipes being preferably circular in section and being open at their upper and lower ends as is indicated more clearly in Fig. 3. It will be noted that all of these cold air pipes 24 are suitably supported upon the framework designated generally by the reference numeral 25, this latter framework supporting the furnace structure as a whole in spaced relation with the fioor. Surrounding each of the cold air conducting pipes space ofuniform thickness may be presented throughout the height of each pair of adjacent pipes located on the same side of the fire box. In other words, a portion of the air to be heated comes in contact with the outside surfaces of the fume conducting pipes 26 and in order that a sheet of air may pass up between adjacent pipes on the same side of the fire box, l have made these fume pipes square in section. All of these fume pipes are closed at their upper and lower ends and the upper portion of each is further in communication with its respective dome 13 by means of the connecting thimble 27. Thus, it will appear that the fumes leaving the fire box structure 9 will pass into the dome 13 and divide, a portion of them passing to the left and a portion ,of them passing to the right to enter the various fume conducting pipes 26. These fume conducting pipes 26 are further provided with a series of baffles 28 designed to impede the progress of the fumes to the chimney, these baffles covering approximately half the cross area of each of the pipes 26 and being located in staggered relation throughout the height of each of these pipes. Connecting each pairof pipes 26 at their lower ends is a pipe 29, these pipes being for the purpose of conducting the products of combustion rearwardly to ultimately enter one of the pipes 29 both of which lead to a final box-like radiator 30 from which the last heat is extracted before the fumes are led to the chimney structure by the pipe 31.

Thus, it will be apparent that l have pro- ,vided a furnace that may be produced or assembled in sections, suiting the demands of the trade. Also, the products of combustion are given a thorough circulation to remove all of their surplus heat to thereby sufficiently heat the incoming air.

What I claim, is:

1. A furnace comprising a plurality of sections, each of said sections comprising a fire box the upper portion of which forms a combustion chamber, a dome surmounting said chamber, a vertically arranged cold air pipe separately formed from and spaced on each side of said fire box, a fume conducting pipe surrounding each of said cold air pipes, diametrically opposed'connecting pipes communicating with the upper portion of said dome and said fume pipes, connecting pipes communicating with the lower portions of each pair of the fume pipes of adjacent sections on the same side of their fire boxes, and a box-like'radiator to the rear of said fire box and dome structure with which radiator said fume conducting pipes communicate.

2. A furnace comprising a plurality of sections, each of said sections comprising a fire box, the upper portion of which forms a combustion chamber, a separately formed dome surmounting said chamber, a vertically arranged cold air pipe separately formed and spaced on each side of said fire box, a fume conducting pipe provided with fiat side walls surrounding each of said cold air pipes, a series of bafiies arranged between each pair of fume and air pipes, diametrically opposed connecting pipes communicating with the upper portion of said dome and said fume pipes, and connecting pipes communicating with the lower portions of each pair of fume pipes of adjacent sections on the same side of their fire boxes.

3. A furnace comprising a fire box, the upper portion of which forms a combustion chamber, a dome structure surmount-ing said chamber, a plurality of separately formed cold air pipes spaced on opposite sides of said fire box, a fume conducting pipe having flat side walls surrounding each of said coldair pipes, connecting pipes communicating with the upper portions of said dome structure and said fume pipes, connecting pipes between the lower portions of each pair of fume pipes on the same side of said fire box, and a box-like radiator tothe rear of said fire box and dome structure with which the two end fume conducting pipes are connected.

4:. A furnace comprising a fire box, the uppenportion of which forms a combustion chamber, a dome structure surmounting said chamber, a plurality of separately formed cold air pipes located on each side of said fire box and spaced therefrom, a fume conducting pipe having flat side walls surrounding each of said cold air pipes so that opposing fiat surfaces of adjacent pipes present flat spaces of uniform thickness between pipes,.connecting pipes communicating with the upper portion of said dome structure and each of said fume pipes, and connecting means between the lower portions of each.

R. M. SPENCER.

Witnesses:

S. H. WHEELHOUSE, WALTER E. L. BOOK. 

